1981 Evinrude 15 HP E15RCIS - Losing Power at Wide Open Throttle

[Geotheoutboardkid]

Re: 1981 Evinrude 15 HP E15RCIS - Losing Power at Wide Open Throttle

I posted my question on this thread because I wasn't sure how to reach the other guy who had a nearly identical problem. The only difference is he says nothing about trying the motor with the cowling off. But if he shut it down for a few minutes then the cowling would have time to fill with air again if in-fact this is an exhaust leak. I think my motor issue is still relevant to this thread.

I want to thank you for your idea, it is something I would never have thought of until I found it myself by working my way through the motor changing items out along the way. This, I think is a great place for me to look to solve this problem. I have never seen any smoke come out from under the cowling, do you think I would see smoke under the cowling if this base gasket was the problem?

Thanks again, and if this doesn't work and if no one else responds to me here I will start a new thread.

P.S. I am still open to other Ideas.

try adjusting the high idle fuel screw, it is running too rich on fuel.

 

[iliketrout]

Re: 1981 Evinrude 15 HP E15RCIS - Losing Power at Wide Open Throttle

I haven't resolved my issue yet. But I should add it's because I haven't actually had the boat in the water. I've been fishing with other buddies who have larger boats. I don't mind Snap posting in this thread, we have very similar problems and I'd be interested to hear the resolution of his problem as well.

I haven't thought of a leaky exhaust manifold. That would make sense, given my symptoms, assuming that when I let the motor idle for a few minutes, the exhaust gasses that leaked may have a chance to disperse.

I need to get the boat out and run it without the cowl to see if this is the problem. If not, I need to run it with another fuel tank and hose to eliminate the foamy fuel issue.

I just re-built the pump and also replaced the fuel lines. I noticed that the supply line to the pump had a kink in it due to the previous owner replacing the line and routing it improperly. Not a major kink, which may explain why it ran and idled well with the kink, but lost power.

Will keep you guys posted if I make any progress.

In the meantime, are there any other ways to diagnose a failed exahust manifold gasket other than looking for leaking exhaust gases?

 

[snapgator]

Re: 1981 Evinrude 15 HP E15RCIS - Losing Power at Wide Open Throttle

try adjusting the high idle fuel screw, it is running too rich on fuel.

Thanks for the idea about the high idle fuel screw, but this carb doesn't have one, just a high idle orifice.

 

[snapgator]

Re: 1981 Evinrude 15 HP E15RCIS - Losing Power at Wide Open Throttle

I haven't resolved my issue yet. But I should add it's because I haven't actually had the boat in the water. I've been fishing with other buddies who have larger boats. I don't mind Snap posting in this thread, we have very similar problems and I'd be interested to hear the resolution of his problem as well.

I haven't thought of a leaky exhaust manifold. That would make sense, given my symptoms, assuming that when I let the motor idle for a few minutes, the exhaust gasses that leaked may have a chance to disperse.

I need to get the boat out and run it without the cowl to see if this is the problem. If not, I need to run it with another fuel tank and hose to eliminate the foamy fuel issue.

I just re-built the pump and also replaced the fuel lines. I noticed that the supply line to the pump had a kink in it due to the previous owner replacing the line and routing it improperly. Not a major kink, which may explain why it ran and idled well with the kink, but lost power.

Will keep you guys posted if I make any progress.




In the meantime, are there any other ways to diagnose a failed exahust manifold gasket other than looking for leaking exhaust gases?

Thanks for letting me know your progress, I wont be able to check the condition of the seal on my motor likely till the winter because I still need to use it until then, but I will keep you posted as to what happens along the way..